Solve the following system of equations: (1 point)

−2x + y = 1

−4x + y = −1

Question

Solve the following system of equations: (1 point)

−2x + y = 1
 

 −4x + y = −1

yoloshroom · Answer

This is a homework review problem, right? <3

anonymous · Answer

x=1,y=3

yoloshroom · Answer

You need to explain.

anonymous · Answer

oh.....
-2x+y=1
-4x+y=-1
y=1+2x
-4x+1+2x=-1
-2x=-1
x=1

anonymous · Answer

You need to isolate the x and isolate the y to one side so you can solve. You can always set the problem equal to zero and plug numbers in to check them

anonymous · Answer

and next we put x on one of equations
-2+y=1
y=3

retireed · Answer

It is easier to subtract equation 2 from equation 1.
−2x + y = 1 
−4x + y = −1   
  4x  - y =  1     sometimes it is easier to multiple equation 2 by - 1 and add
in either case the y is eliminated 
 2x  +  0 =  2
 
solve for x and plug it back in and solve for y